write empty values to the csv

src/services/exporter.ts

@@ -146,18 +146,12 @@ export class Exporter {
 
   private _writeCsv(stream, series) {
     for(let row of series.values) {
-      const isEmpty = _.every(
-        _.slice(row, 1),
-        val => val === null
-      );
-      if(!isEmpty) {
-        let csvRow = {};
-        for(let col in series.columns) {
-          csvRow[series.columns[col]] = row[col];
-        }
-        stream.write(csvRow);
-        this._task.progress.exportedRowsCount++;
+      let csvRow = {};
+      for(let col in series.columns) {
+        csvRow[series.columns[col]] = row[col];
       }
+      stream.write(csvRow);
+      this._task.progress.exportedRowsCount++;
     }
   }